mesa, arizona, when a woman approached her in her apartment building's parking lot and flung acid at her face. she said her attacker never said a word. >> i just kept screaming. call 911. >> the attack is eerily similar to another in vancouver, washington, just days before. >> i could hear it sizzling. once it hit me, i could hear it bubbling and sizzling. >> bathe nil had been on her way to starbucks when a woman assaulted her. saying hey, pretty girl, would you like to drink this. while throwing a cupful of acid into her face. >> if i saw her, i would instantly know. i would know right away. >> neither knew her assailant and no arrests have been made. but in the arizona case, investigators say they think valardi's attacker single payered her out specifically. >> it appears it's not a random act that there's someone who was waiting there for her to specifically attack her.